ASOL 302025 Lithium Polymer Battery — An ultra-thin rechargeable Li-Po soft pack battery engineered for compact wearable and miniaturized electronic devices. Delivering 110mAh (0.407Wh) in an exceptionally slim 3.1mm profile (20.5mm × 28mm footprint), this battery sets the standard for space-constrained power solutions. It is the ideal power source for smart watches, fitness bands, TWS (True Wireless Stereo) earbuds, in-ear hearing aids, smart glasses, portable medical devices, and other next-generation wearable electronics. The aluminum-laminated soft pack construction ensures a lightweight, safe, and reliable power solution that fits seamlessly into the most space-sensitive product designs.
🔋 Why Polymer vs Cylindrical?
Unlike traditional cylindrical batteries, lithium polymer batteries offer:
- 📏 Ultra-Thin Profile — Only 3.1mm thickness for ultra-slim, form-fitting devices
- 🔄 Flexible Shape — Adapts to curved enclosures, earbud shells, and irregular form factors
- 🪶 Lightweight — Critical for wearables that must be comfortable for all-day wear
- 🔒 No Pressure Vents — Safer for sealed miniaturized devices worn close to the body
- ⚡ Higher Energy Density — Maximum power in minimum space for all-day battery life
- 🛠️ OEM-Friendly Customization — Tabs, wires, connectors, and protection circuits available
Key Features
- ⌚ Ultra-Compact Capacity — 110mAh (0.407Wh) powers smart watches, fitness bands, and all-day wearables
- 📦 Soft Pack Design — Aluminum-laminated polymer construction, lightweight and flexible
- 📐 Ultra-Slim 3.1mm Profile — Engineered for ultra-thin wearable device enclosures
- ⚡ Ultra-Low Internal Resistance — ≤15mΩ AC impedance for highly efficient power delivery
- 🔄 500+ Cycles — Long service life with minimal capacity fade (tested at 100% DOD, 1C)
- 🌡️ Wide Temperature Range— Charge: 0~45°C / Discharge: -20~60°C for versatile environments
- 🔧 Custom Integration — Available with tabs, wires, connectors, or protection circuits (PCM/PTC)
- ✅ UN38.3 Certified — Safe for air transport worldwide
- 🏭 OEM/ODM Support — Custom dimensions, capacity, connectors, and branding available
Technical Specifications
| Parameter | Value |
|---|---|
| Model | 302025 |
| Cell Type | Lithium Polymer (Li-Po) Soft Pack |
| Nominal Voltage | 3.7V |
| Nominal Capacity | 110mAh |
| Energy | 0.407Wh |
| Dimensions | 3.1mm × 20.5mm × 28mm (T×W×H) |
| Thickness | 3.1mm |
| Configuration | 1S1P |
| AC Impedance | ≤15mΩ |
| Charge Voltage | 4.2V |
| Standard Charge Current | 55mA (0.5C) |
| Max Charge Current | 110mA (1C) |
| Discharge Cut-off | 2.5V |
| Max Discharge Current | 110mA (1C) |
| Charge Temperature | 0~45°C |
| Discharge Temperature | -20~60°C |
| Storage Temperature | -10~35°C (recommended for long-term storage) |
| Cycle Life | ≥500 cycles (100% DOD, 1C charge/discharge, 80% retention) |
| Certifications | UN38.3 |
Applications
| 🎧 Audio | ⌚ Wearables | 🦻 Medical | 👓 Eyewear | 📍 Tracking |
|---|---|---|---|---|
| Smart Watches | TWS Earbuds | Hearing Aids | Smart Glasses | GPS Trackers |
| Fitness Bands | Hearing Amplifiers | Blood Glucose Monitors | AR Glasses | BLE Beacons |
| Smart Rings | Bone Conduction | Pulse Oximeters | Camera Glasses | Pet Trackers |
| GPS Sport Watches | Biometric Earbuds | Health Patches | Audio Sunglasses | Smart Wallets |
| Sleep Trackers | Wireless Earplugs | Temperature Patches | Smart Magnifiers | IoT Sensors |
⌚ Smart Wearables & Fitness
Smart watches, fitness bands, GPS sport watches, activity trackers, step counters, sleep trackers, heart rate monitors, GPS running watches, cycling computers, sports watches for kids, smart rings, smart clothing sensors
🎧 Audio & Earbuds
TWS (True Wireless Stereo) earbuds, single-ear earbuds, Bluetooth earplugs for sleeping, bone conduction headphones, hearing amplifiers, in-ear biometric earbuds, wireless earphones for sports
🦻 Medical & Health Devices
Digital hearing aids, OTC hearing amplifiers, blood glucose monitors (CGM sensors), pulse oximeters, blood pressure monitors (wrist type), smart health patches, wearable ECG monitors, temperature monitoring patches, medical alert wearables
👓 Smart Eyewear & Vision
Smart glasses (e.g. Amazon Echo Frames, Bose Frames), AR smart glasses, sports goggles with heads-up display, camera glasses, audio sunglasses, smart magnifiers, electronic reading aids
📍 Tracking & IoT Devices
Bluetooth item finders (e.g. AirTag-style trackers), BLE beacons, smart wallet trackers, smart luggage tags, GPS pet trackers, asset GPS trackers, IoT sensor nodes, environmental monitoring sensors, smart home beacons
Why Choose ASOL Li-Po Batteries?
ASOL Battery is a professional lithium polymer battery manufacturer with years of experience supplying OEM and ODM partners worldwide. Our ultra-thin Li-Po soft pack batteries are engineered specifically for the demanding requirements of modern wearable electronics — from smart watches and TWS earbuds to medical-grade wearables and smart eyewear. The 302025 combines industry-leading energy density with an ultra-slim 3.1mm profile, enabling product designers to create sleek, lightweight devices without compromising on battery life.
Every battery undergoes strict quality control and is UN38.3 certified for safe global air transport. We offer flexible customization including custom dimensions, connector types, wire lengths, protection circuits, and branding options. Reliable performance, consistent quality, and responsive technical support — that’s the ASOL promise.
Wholesale Pricing
| Quantity | Unit Price | Savings |
|---|---|---|
| 100-499 pcs | Contact us | — |
| 500-999 pcs | Contact us | 8% off |
| 1000+ pcs | Contact us | 15% off |
Sample orders and custom specifications are welcome. Contact us for detailed pricing and lead times.
Contact Us
| Channel | Information |
|---|---|
| info@asol-battery.com | |
| +86 15779858703 | |
| 🌐 Website | www.asol-battery.com |
| ⏰ Response Time | 24 Hours on Working Days |
